US 12,257,863 B2
Pneumatic tire
Kenji Hamamura, Kobe (JP); Hiroki Kawai, Kobe (JP); and Subaru Toya, Kobe (JP)
Assigned to SUMITOMO RUBBER INDUSTRIES, LTD., Kobe (JP)
Appl. No. 18/018,103
Filed by Sumitomo Rubber Industries, Ltd., Kobe (JP)
PCT Filed Jul. 26, 2021, PCT No. PCT/JP2021/027586
§ 371(c)(1), (2) Date Jan. 26, 2023,
PCT Pub. No. WO2022/030285, PCT Pub. Date Feb. 10, 2022.
Claims priority of application No. 2020-132411 (JP), filed on Aug. 4, 2020.
Prior Publication US 2023/0286330 A1, Sep. 14, 2023
Int. Cl. B60C 3/04 (2006.01); B60C 1/00 (2006.01); B60C 13/00 (2006.01); B60C 15/06 (2006.01)
CPC B60C 13/00 (2013.01) [B60C 1/0025 (2013.01); B60C 3/04 (2013.01); B60C 2001/005 (2013.01); B60C 2013/006 (2013.01); B60C 2013/007 (2013.01); B60C 2015/0614 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A pneumatic tire having a sidewall and a clinch portion on each of a pair of side portions, wherein
(tan δsw+tan δc)≤0.3 and |tan δsw−tan δc|≤0.07 are satisfied, where tan δsw is the loss tangent of the sidewall and tan δc is the loss tangent of the clinch portion, measured under the conditions of 70° C., frequency of 10 Hz, initial strain of 5%, and dynamic strain rate of 1%; and
when the cross-sectional width of the tire is Wt (mm), the outer diameter is Dt (mm), and the volume of the space occupied by the tire is the virtual volume V (mm3), when the tire is installed on a standardized rim and the internal pressure is 250 kPa, the tire satisfies following (formula 1) and (formula 4):
1700≤(Dt2×π/4)/Wt≤2827.4  (formula 1)
[(V+2.5×107)/Wt]≤2.75×105  (formula 4).